In a supersized country you need move a lot of things at once to keep the number of long trips down.
One way of doing this is the famous Australian Road Train. Here I caught a Shell one at an outback fuel station. Not sure what his superiors at Shell would say about him filling up at Mobil :-)

The problem with that is, that the country is so big and population so spread that maintinang a huge rail network would not be viable. They have to maintain raods for private use so they might as well have road trains use them as well